IRS27951SPBF International Rectifier, IRS27951SPBF Datasheet - Page 15

• Manufacturer Part Number: IRS27951SPBF
• Description: IC DRIVER HALF-BRIDGE 8SOIC
• Manufacturer: International Rectifier

Specifications of IRS27951SPBF

• Output Isolation: Isolated
• Frequency Range: 46.6kHz ~ 285kHz
• Voltage - Input: 12 V ~ 18 V
• Voltage - Output: 12 V ~ 18 V
• Power (watts): 833mW
• Package / Case: 8-SOIC (0.154", 3.90mm Width)
• Package: 8-lead SOIC
• Circuit: Resonant Half-Bridge
• Offset Voltage (v): 600
• Output Source Current Min (ma): 300
• Output Sink Current Min (ma): 900
• Vcc Range (v): 10-20V with UVLO
• Programmable Frequency (khz): 25-500
• Programmable Deadtime (ns): 200-2000
• Ocp Threshold (v): 2
• Pbf: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Frequency and Dead-time Calculation
The dead time is calculated by the following equation:
www.irf.com
- For closed loop systems with feedback control, a resistor Rfmax can be connected between the
RT pin and the collector of the (emitter-grounded) phototransistor. The feedback loop modulates
the current through the phototransistor and hence, the oscillator frequency for output voltage
regulation.
- The converter maximum frequency is set by (Rmax//RT) and CT.
Figure 2: Typical startup waveforms with soft-start
t
DT
(
. 0
85
C
T
40
pF
15
)
2
2
mA
V
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